Expressing 40-50ml is just normal for some people, that's about as much as I get when I express. The amount that you express is not the amount that baby gets when direct latching, pumping is harder. Baby is much more effective, so keep on direct latching. I know my baby drinks about 80-100ml when taking EBF from bottle.
During the first few weeks (or during confinement) your supply is regulating and your body is defining the amount of milk required. Ideally you shouldn't be expressing in the first few weeks. I'd say that keep on direct latching, having skin to skin, should be ok. Drinking lots of water is important too (I drink about 5 litres a day).
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